<template>
  <section class="msite">
    <!--首页头部-->
    <HeaderTop :title="address.name">
      <router-link class="header_search" slot="left" to="/search">
        <i class="iconfont icon-sousuo"></i>
      </router-link>
      <router-link class="header_login" slot="right" :to="userInfo._id? '/userInfo' : '/login'">
        <span class="header_login_text" v-if="!userInfo._id">登录|注册</span>
        <span class="header_login_text" v-else><i class="iconfont icon-person"></i></span>
      </router-link>
    </HeaderTop>
    <!--首页导航-->
    <nav class="msite_nav">
      <div class="swiper-container" v-if="catgorysArr.length">
        <div class="swiper-wrapper">
          <div class="swiper-slide" v-for="(catgorys, index) in catgorysArr" :key="index">
            <a href="javascript:" class="link_to_food" v-for="(catgory, index) in catgorys" :key="index">
              <div class="food_container">
                <img :src="baseImgUrl + catgory.image_url" />
              </div>
              <span>{{catgory.title}}</span>
            </a>
          </div>
        </div>
        <!-- Add Pagination -->
        <div class="swiper-pagination"></div>
      </div>
      <img src="./images/msite_back.svg" alt="back" v-else/>
    </nav>
    <!--首页附近商家-->
    <div class="msite_shop_list">
      <div class="shop_header">
        <i class="iconfont icon-xuanxiang"></i>
        <span class="shop_header_title">附近商家</span>
      </div>
      <ShopList/>
    </div>
  </section>
</template>

<script>
import {mapState} from 'vuex'
import Swiper from 'swiper'
import 'swiper/dist/css/swiper.min.css'

import HeaderTop from '@/components/HeaderTop/HeaderTop.vue'
import ShopList from '@/components/ShopList/ShopList.vue'

export default {
  data(){
    return{
      baseImgUrl:'https://fuss10.elemecdn.com'
    }
  },
  components: {
    HeaderTop,
    ShopList
  },
  mounted() {
    this.$store.dispatch('getCategorys')
    this.$store.dispatch('getShops')
  },
  watch:{
    //监视categorys，数据变化之后创建Swiper对象
    categorys(value){
      //界面更新之后立即创建Swiper对象
      this.$nextTick(()=>{
        //创建Swiper实例对象
        new Swiper('.swiper-container',{
          //分页器
          pagination: {
            el: '.swiper-pagination'
          },
        })
      })
    }
  },
  computed:{
    ...mapState(['address','categorys','userInfo']),

    catgorysArr(){
      const {categorys} = this
      //准备二维数组
      const arr = []
      //准备一维数组
      let miniArr =[]
      //遍历categorys
      for(let i = 0 ; i < categorys.length; i++){
        //一页规定八个
        if(miniArr.length < 8){
          miniArr.push(categorys[i])
        }
        //当miniArr存满八个 或者 categrys遍历结束 就存入arr
        if(miniArr.length===8 || i===categorys.length-1){ 
          arr.push(miniArr)
          //存入arr后，置空miniArr重新存储
          miniArr = []
        }
      }
      return arr
    }

  }
};
</script>

<style lang="stylus" scoped>
  @import "../../common/stylus/mixins.styl"
  .msite  //首页
    width 100%
    .header_search
        position absolute
        left 15px
        top 50%
        transform translateY(-50%)
        width 10%
        height 50%
        .icon-sousuo
          font-size 25px
          color #fff
    .msite_nav
      bottom-border-1px(#e4e4e4)
      margin-top 45px
      height 200px
      background #fff
      .swiper-container
        width 100%
        height 100%
        .swiper-wrapper
          width 100%
          height 100%
          .swiper-slide
            display flex
            justify-content center
            align-items flex-start
            flex-wrap wrap
            .link_to_food
              width 25%
              .food_container
                display block
                width 100%
                text-align center
                padding-bottom 10px
                font-size 0
                img
                  display inline-block
                  width 50px
                  height 50px
              span
                display block
                width 100%
                text-align center
                font-size 13px
                color #666
        .swiper-pagination
          >span.swiper-pagination-bullet-active
            background #02a774
    .msite_shop_list
      top-border-1px(#e4e4e4)
      margin-top 10px
      background #fff
      .shop_header
        padding 10px 10px 0
        .shop_icon
          margin-left 5px
          color #999
        .shop_header_title
          color #999
          font-size 14px
          line-height 20px
          
</style>